In such cases it becomes necessary to apply the

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Unformatted text preview: ions from which the equilibrium composition can be determined. We have shown earlier that a reacting system at a specified temperature and pressure achieves chemical equilibrium when its Gibbs function reaches a minimum value, that is, (dG)T,P 0. This is true regardless of the number of reactions that may be occurring. When two or more reactions are involved, this condition is satisfied only when (dG)T,P 0 for each reaction. Assuming ideal-gas behavior, the KP of each reaction can be determined from Eq. 1615, with Ntotal being the total number of moles present in the equilibrium mixture. The determination of the equilibrium composition of a reacting mixture requires that we have as many equations as unknowns, where the unknowns are the number of moles of each chemical species present in the equilibrium mixture. The mass balance of each element involved provides one equation. The rest of the equations must come from the KP relations written for each reaction. Thus we conclude that the number of KP relations needed to determine the equilibrium composition of a reacting mixture is equal to the number of chemical species minus the number of elements...
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This note was uploaded on 06/15/2009 for the course MAE 3311 taught by Professor Hajisheik during the Summer '08 term at UT Arlington.

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